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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de74ad468da6de376612e2de127fb05d894f814bae16620f0718b15609078568' 
  AND token = 'iRSgPnbAX6+l+y+ducur0BmG8dTmmH7PceacANCO5YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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