SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f19c7eb418f54b709f25190926c53e3ac8e98b590cdc8e69a40e74f3c75d9975' 
  AND token = 'YJQsMbLo1sqXrCLBlysYaKKy6cPGxDURUFTzZhBLGyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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