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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef728a71355ce97ecc33fb28c98507e6481ee927d52538e7ddbc2cbe85fc8a8e' 
  AND token = 'iQfJpPxa+6onGUBDA/NRFnLKPg1uBAtkIEvoa311ETg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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