SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d08fa7069bd3d1bb3ef5e806ff29513e21f1dab5101e27da2285b0b60974b7c' 
  AND token = 'KFFYKiifJCO0pRZpt4GXwx3PjX5OIqGZMn5N6kz2QsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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