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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ca830383b4ca01b968ca8f52424c290ebfe40239389a489745f09b89af6956' 
  AND token = 'i8Euf6A1JcZcF/DzNxnSYVL7Z2+QWtJxh5MJDtTN1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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