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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6490f72ad279518e0d13cb15a9232398b4b86a4af3fda4a54fb3f80ae5ac7ad6' 
  AND token = 'TSOyaeTUUJa019JFBAu2kLv2TEtGmemiBNEXpEDTuIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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