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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b2b694dd04ea0c9c78bb4a9cdd12b05203a9a81048b3f83bd88d6e0a7e507e' 
  AND token = '3/oTrs9ZSjyyKTIGgxH6S/Yqo41gwtPK2GyOQ54QZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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