SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a6e52949108978d90d66ed99537921b46d2d491d21f3dcb78a6b6fa00c0cbe5' 
  AND token = 'BMgr4sg2wbUviJjwVq2NmQBiCOGYfUK04dOOh5lFGZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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