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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24dbc9ac0d801b784164203edaf52a416fe4daaac0564e40561fe3abbe961f50' 
  AND token = '7SbwSl4DCWO9peYyQ3Pr7o/Bby8AebQB//SurY8LyoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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