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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ad5b24a892e7045912ad054ac7b6416586b6939caf2bd232f83fbe806bb3146' 
  AND token = 'i583gaVLOSC1o84HGYg0kLADPHpdFXJtHW4XX4WzOUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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