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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e445bfec1c4bc1410fb5ca2d51468c507980eac06240511749fceead24de6d' 
  AND token = 'eGjHWXZieSi4zYixLtbF72VFIakhxo524rUV1zs6+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}