SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ee38da34786ff7a7b07f24cfbb4494b17fd8e061a9afa2e6aa3e5c60853054' 
  AND token = 'SdVPSIKMcvnqBLoyXQZt3LVRkyy0YYuHhpIaEchsXjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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