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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a482fadf3c96238f8743c96ce921c70e1cf925fecf87d1c2acb75bd3ae226e6b' 
  AND token = '39JlNRQiM379S8leBFJpYZU+Jy4THoSti5j5YdO0sII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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