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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '680bb026b9873f16d5c7b9785c0e300da9b2d9f30fb91854dcaac053c4e274d6' 
  AND token = 'RwEWyVZbE87a1EfkulU2wU1ohO9e8K3p88B24X06VZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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