SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8771ebfad38882b85b50d86424215a6f06475f47f633664441625e0541767911' 
  AND token = 'eHMBWm+CHPK6zPxp8innvnJM/3n5WvKYlyhfGPIZMpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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