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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd344e0df2430aa232ac48573c4956f0d3bb3b0728bdc1ea9b25dfae975b5d824' 
  AND token = '/QG6+s/E8e/J6v8QIAION8+i5O/hdf2owriL6UneiXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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