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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8e45a2f47a119d6285b06e0b307e677cd866244f327ce16ee440494efdba8a8' 
  AND token = 'YVSHFH79khsO/fnv7GRxmByDGtTD//tYXcObyVlkwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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