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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96682fb835cda0215ea6f4d76bfd27c6daf016af5a5b63e212732cc17e88c609' 
  AND token = 'f6JAiTAZblbhK01vgO+pdNvX6baXtISzLwtQ6O+tvoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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