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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d77ac45c7cbf0597e47a34144d99a3c9dec79a35ee2ffd1b4c3651e769b9703' 
  AND token = 's7NEfT1KcmPwJfWVCVmZphtVB3WAi/da6rqxvEyxBDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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