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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b74151720b5859fd7f9b8a7b4552991b61b655b852abad23bc53da50b8ee8fb5' 
  AND token = 'WgNJYAMRlouXHWsM9+CIK/CV99r2GMCoCBx50Xg9sis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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