SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f46bda206fc53f73d1214c91207199b4abe06746482b404fb5c0d59b3e6a774' 
  AND token = 'vdfNX/LqWAI0PoKkw0QCex2RIH+XjTdfFybJK0iVQZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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