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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '675aef1bd4212ad1acd6919005cb5deee6deb308226b402bed58d2dc4e1c3450' 
  AND token = 'loIAGZ+J8hIzBGxilvf1JNPOdLHprEyIcrgUKvDUBKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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