SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26b107f5eaec929394d42d0c8c7819b3ac49eb0d8ad55d12df35ca2c4bb3d4c4' 
  AND token = 'YYMEYLzkP/6rzXjPdVT+i08yX0yIMGW9J6SDEqBmsqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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