SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '032412ffa97c1038f17b1805ec5c8509c8b792a6884963c95847a1bb125c45b6' 
  AND token = 'NpauUnhfXGWSt+zcbRXYpQ1wxGaYItlD7iOZgUXF0po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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