SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3883d36f75bc7fe8fce14bff9725d265665d11568effee40a1b09143d2b8a89f' 
  AND token = '8yQOwRBmfJI+wFUlugccXIfCspKxDfwvTE6fVHk/vNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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