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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc23f564d7f2aed34f41a1e96fd08f4f0913bc122c608e2c3d9ff6c3ea006eb4' 
  AND token = 'mfQ07AdupudrVu5m7A8iFLQ+c7n47kpTNalbQHBSlQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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