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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d3b6db6920427f343a83bac8834e083d5f2818b0fd3381a8fe0d73e9e9c8e1a' 
  AND token = 'QRadgWH7JiJatN3TgRIC4XoOYHP32zjEe5XwPArQtE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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