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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1270747f7e6bff4f5163e8bd3ab82f83968d5c711be2060e2f9a767f22916aa0' 
  AND token = 'Uth1A8Ac4o8xKy0kaDT+cryDp7GDxp9gyDQg4tvgEcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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