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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9414b1aa5eee63c9bb50f1a8d5e0fe7557ee3e2fd5d89b18dd13dbb23b4fe18a' 
  AND token = 'LN2BDXYLi2X/YwKbYoaUHEdBxvEhGhiX/BoSHH22B/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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