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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '738aeddaa8b336e1bf5cd6650625f52b079b63676e1c6c6113d0d129f3b743dc' 
  AND token = 'E772YX6QRF4A5zqfwg50S1BP7nmeQ51rTD/3OGx+72A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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