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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43b5db63528e4637910514e779408b992d11c44a089b4c7b8d5891ef923d88c1' 
  AND token = 'T2u8pD+lAVTO7U2no3Ki8ZtT372jDvnC0t5xjN21aTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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