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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '574b461d3f65fd51cdad4b2ce2bd12c19cd7dc0beef6ee8632c2766d05ba7c54' 
  AND token = 'DScEKIQ4w3r4A6FyqQPekBcyiYvTAn2Wirio/gwbIVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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