SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233d66cb1d44fe3f388c749650baf549e1a5507c8bbc1b6d146382d949b5d670' 
  AND token = 'yVwj0AIK3wKWLMWX7Xnxo78PHeGliAjL0TzYCv+gUJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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