SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d758e4e47ad45991818482eef3dcb249a02f39a5c57617ab59d43edfdc848c' 
  AND token = 'zHKpcM+qhm29g+XZRwNwZj/gDF0abZe/CjJ9Od3tGsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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