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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd21803bbb7e466ca3eb15f89ff5bd4950ab5e8adb1b7ec2c09722b52398eff86' 
  AND token = 'sdLA0YODH7EFY0C2nR+MY1hAm5l99V1K3fPdzqEyL1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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