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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a81e573ba89bb0c16699c8f2ce46d2bb8a49518889bb0a6a10aa1d9d03d69fe3' 
  AND token = '9l6Y3D6lKcyU5lD847rS5/amoyBYMl1VK9zZCN3tfiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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