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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad34000f228d6c237195b5c2cdc66f3d656334d9be387ec03934bb9a8a61ec8' 
  AND token = '55M38J9cYLFUItFRPE9L8EZNdzHAcI1v0hJGeKbd37A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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