SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa4c8a5c1b6740fc22f732a328783056f9746695fbc9ab12d73fea2245d6626d' 
  AND token = '/PQ6WuYjzHq1ivY9Z+V7TUxv3r4sgvHruk2rjN3NtJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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