SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02eecb5177505fd4ce72da9213f5cf3045ad6017893bee617b090d70a3433388' 
  AND token = 'VmR1T+IIKapdulGd9XrWDIzz3f9gJRjFC5BOd+Kd2tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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