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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '804832ecfa0e49d2a593c8b70e8f91e14c08c7d3cd3913cb34ac2785281e17af' 
  AND token = 'CrPIQdfWOILIg0r6Wf1NPxuOIdID2/eShkEgttRuXzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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