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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c26812dd48d27e292db5f726c37e2c33d2928dfbaf36ede3a4d5e0bd1336cb7c' 
  AND token = 'sWSdRz7EibWl+xBFuschEwzP7kn9CKvwWOmtjIhKBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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