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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec56de7c8b02060724d525d7b087e494970ebaa0b58acde862497e7a2544613c' 
  AND token = 'J5iSgqZZkJqr2Tyz+gjxX1k3WKkV29crq/yEK5cc/Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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