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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e1b4452d7e6bc085bba1d7b7bb880dd9bb2f3d2089dbcf6be7aab202a58ef7e' 
  AND token = '0GKgvb1jbCr+wUaecgscPl6jzEp0SkJnYPe6pCRfFvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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