SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd170ba0a97448ae401202ba9994eb63ed8d31ff544616d39d95e31f0e0de3ecc' 
  AND token = 'v+yAH7HNlMMUh8YMIo5UcqRHORFqfhQz9vz6kHZSHBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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