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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61b16c0b0b857419f6a65b749637a79e2e43ad39be78c2bc4e630bac3cafdcd6' 
  AND token = 'fRxDYeWev2GJ8OdSCSKO1klGlkkW7hLDzknXjjgtFb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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