SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2b9ab842cd1dd933e942cb2e29e983816a0c1b9531daefad69b4b0f8b07e368' 
  AND token = 'KTQfGUqorsKsn2NXv/r7Dv2uGKKI18m+24UZBliTVLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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