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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61c5c8e1b970ea66e9c7056f3d91c5a6012696c1deee46c8f2acc148a9a71793' 
  AND token = '/2sD3GeS+V5CjzC7eDYRFL8zSJfXpVMQ9zgU2HD2bYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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