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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca3610af0c389beac9bdecb20cafa3bc793c29ba866af3f9da667badc8b6e52' 
  AND token = 'IbMaOsyjpUJYt97aig0iQS2oqPM12if+UZ+E1CWRDrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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