SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60c26bf33ea1a5a1d4d972fe97fb2a6b61e1989d8b808d61f1cff2275bcfda29' 
  AND token = 'KMdpKe14XzZJ4U9URFiLk/jdl9Pufl/6HlV7HzIx5ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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