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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28df22961b489c92ddf93de4974dce171bdb9b9cdb659b14adb5b5011e8ae22e' 
  AND token = 'DwkFvHdZDapJ2f3IZ95EuV/PPTWmnhoNOxBdsvcd1oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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