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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '309afdcceafa0b65c669885e8046722d28e98b455793b4ab8c34aa60ca14f3e6' 
  AND token = '3cfQ07Zor03OUA2yLruvuyfkDrN06UgvcD0OXGSxTK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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