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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5d1a81bd8aa4c5773c4c34edb8ec0b7235ce9ff2ef4eac31872efeedebd349' 
  AND token = '9jQ0XFVtBShKiUbWJ1nN7iMmWait3laNK+40Meo3uoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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