SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5e6634cc607f97f67304e8db333bf939ba845483356cfb7ca65b5b0536f8df' 
  AND token = 'RZ+ll/nACcYLOq2wLqtGHuNlJltVmW/YxSt19mbW4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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