SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e3482c98bc3efe173fbb66d044d187fa9ddac0b2dc29063eb080b704a170cb4' 
  AND token = 'SKu56VZnuKJUhYpvZBoCoraj3o7EYAQjZi1XiyNXFkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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