SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd88f44499cf9a6628377a12fe60c770aec89e472fffb3775a161862de99cbbc9' 
  AND token = 'zXXZUZj13GxDBsGB8cHBVkgcxK2abKL7skVMr25bVqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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