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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '798729712efdf1dd85e045d67942dd03f285e0925910d0dff594a73bc7ffcf05' 
  AND token = 'A5hiFaQjZ3LV7H2kir2+QxufSlHEV62i++kQoY8VSy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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