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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd83cb1019a81866bb6e82739827c3223f00567a4082ca66cc6e4d08f7d7915f' 
  AND token = '3J0zMdFxlxTzsSMkRHnh/ErV+/dX6cR/SS4k/UDfIY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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