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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64cd744c7d4fdbefeedeefd4b5d061802f5a63eb2a0856ed427f84e9bada84d0' 
  AND token = 'XwrKjq7FuDHB4iCReG25QBb6/uAqs9yo746pmHQXRzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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