SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0f967cd962570e3b2f51ce69286cb7a14585cc1fe044319cf7452eaad3ead2f' 
  AND token = 'OULAthxleDGhyLiPjQVrsUMLe7K8TvRZ7j9KY79fyq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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