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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a23cf34279b7ada824a843f866ad39a778e5f58582a9cba3f2ff49fb82aec823' 
  AND token = 'va7A0WGUuuYiNOdCU0VSCRA6bQsij2i/EpaL6a5oHbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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