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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92937bfb8a4fe99b85a2e76d4535c779df144bd950d4e5f7f80bbca5a8528c4f' 
  AND token = 'Po/1nnDiwzk+6q0sYaH8stcZ0xJv14eux7Yjze0ssn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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