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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7c3383610ab9edbfe7fb8cc23e48e8ccd639a1a7d76ae064137885f5125782d' 
  AND token = '9zdl2WjK0hpcscBSr7lFUAjwFRpM5Iz/xlyKJ/H/dwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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